My car is running really rough, (smoking from exhaust, i think its running really rich?) its a explorer motor with E cam. its a mass air system. ive changed complete wire harnesses, sensors, fuel rail, injectors, computers checked for vacuum leaks and still had no effect on the way it ran. the last thing i can think of is if i didnt have my gears properly lined when i put the motor together. maybe 180 off?? would that cause the car to burn an excess of fuel or burn it at the wrong time and make it smoke?. or would i be wasting my time taking that back apart?